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Cracked Cal 14 Exhaust Parts

You can add my 2017 California to the list of broken exhaust components, 17600 miles. I was both fortunate and unfortunate as to when and where it happened; unfortunate in that I was 1500 miles away from home, and fortunate that my return route allowed me to make a slight detour to GT Motorcycles to get the replacement parts fitted. The pipe split on a Monday afternoon. I emailed Todd to see if he had a replacement available, which he did, and I could schedule it to be installed on Thursday morning when I was passing through.

I was able to band-aid the system together using the hose clamp setup that kdirtrider posted on page 3 of this thread. I did not use the muffler tape as I was planning on just replacing the h-pipe and didn't want a bunch of melted tape on the header. The hose clamps sealed things back up reasonably well enough to make the trip from Tucson to Orange without issue. I wasn't able to get any pictures of the setup, but the way the pipe breaks at the weld allows it to seat and seal decently for a temporary fix.

I had intended to just replace the h-pipe. After disassembly, we discovered a large crack in the heat shield on the header right in the middle of the bend downward from the exhaust port. I knew the crack was just going to spread and cause buzzing and rattling, so I went ahead and had the headers replaced as well. I went with the brushed stainless for ease of maintenance, and also had the mid-pipe installed to retain the heat shields. Some may not like the look, but form follows function for me in this case. I'll see if I can get some photos tomorrow at some point.

The quality of the parts is great, the headers are port matched and then step up slightly for further tuning of the exhaust flow. Even with the Lafranconi mufflers with the baffle installed, I noticed smoother operation and better response in the 2500-4500 RPM range.

If anyone is wondering if a newer bike is susceptible to the h-pipe failure, I'm sad to say it is. I highly recommend to replace it before it breaks. Better yet, just replace the headers before other things happen as well, since the same inferior steel is used all the way to the mufflers. I am very happy with the results. Even better, I was back on the road before lunch with plenty of time to get to my next destination.

Dave
 
I just completed a 3,900km trip from Johannesburg to Cape Town and back.
The left side connection broke off during the last 300km. Currently on 24,000km's - at 13,000km's the right side broke off which was welded, still intact.
What type of metal is used for the exhaust (not chromed bit) and connector pipe, mild steel or stainless steel?
I was thinking to have it brazed if it is mild steel which I understand is stronger than welding of stainless steel.
The welding/brazing option is much more affordable as opposed to importing a complete better quality system - our exchange rate in South Africa is very weak against the USD, Euro or British Pound.
Advice will be greatly appreciated, thank you.
 
Hi Chris, please read this thread. You will find most of your answers. Exhaust is low grade stainless. Braze or welding is temporary/futile. The headers will crack and come apart as well.
 
I just completed a 3,900km trip from Johannesburg to Cape Town and back.
The left side connection broke off during the last 300km. Currently on 24,000km's - at 13,000km's the right side broke off which was welded, still intact.
What type of metal is used for the exhaust (not chromed bit) and connector pipe, mild steel or stainless steel?
I was thinking to have it brazed if it is mild steel which I understand is stronger than welding of stainless steel.
The welding/brazing option is much more affordable as opposed to importing a complete better quality system - our exchange rate in South Africa is very weak against the USD, Euro or British Pound.
Advice will be greatly appreciated, thank you.

Chris,

What Todd said...

But, if you can swing it financially with the exchange rates, Todd offers an H-Pipe replacement her in the "Store" that I bought and installed on my California 1400. After the right side weld on the crossover breaking while on a trip I had it welded by the guys at Harper's Moto Guzzi. Later, on the same trip, the left side broke. Welding (or brazing) is a temporary fix as the design of the OEM crossover does not allow for thermal expansion and it will fail again.

Best of luck on whatever solution you choose!
 
Do you have an example of any exhaust system on an internal combustion engine that doesn't
have to deal with 'thermal expansion' ? Next question , how many exhaust systems are not welded ?
Just asking . Peter
 
Do you have an example of any exhaust system on an internal combustion engine that doesn't
have to deal with 'thermal expansion' ? Next question , how many exhaust systems are not welded ?
Just asking . Peter
Peter,

1. No, I am sure there is no internal combustion engine that does not have to deal with thermal expansion.

2. Many exhaust systems are welded. However, the ones that do not have a problem with splitting, cracking and breaking due to thermal expansion have at least one point that is designed to flex, thereby keeping stresses from getting high enough to cause a failure in material or weld.

In the case of the OEM exhaust crossover on the California 1400, one side of the crossover pipe slides into the crossover pipe from the other side. The fit is very tight, even when cold. Then, MG placed a clamp on the connection. Maybe to ensure that the pipes could not separate? I don't know why they chose to add a clamp at this juncture since it is not possible to get the pipes separated until you unbolt one of the headers at the cylinder. But, this is how the OEM design is done. The problem with this, relative to thermal expansion, is that the "sliding" pipe joint is held captive (1) by friction as they heat up and (2) by the factory installed clamp. In order for this to all work, something has to flex. The weak point turns out to be where the crossover pipe is welded to the header.
 
Also , the exhaust headers ( and crossover) are mounted to a rubber mounted engine and rigid
mounted mufflers ( at least on my 2018 Eldorado ) ! They do have a chance to flex at the mesh
point however . I'm not sure of the earlier models , but on mine there's an added (welded) bracket
from the header to the crossover , that may be a later fix to prevent this cracking from happening.
Peter
 
Also , the exhaust headers ( and crossover) are mounted to a rubber mounted engine and rigid mounted mufflers ( at least on my 2018 Eldorado ) !
The OEM muffler mounts, below the passenger pegs, do in fact have rubber mounts hidden in the cast portion of the hangers.
 
^ That's correct , the thing is they have such an extremely limited amount of movement . Just went out
and attempted to move them about and the alloy foot-peg bracket deflected almost as much as the mufflers.
Peter
 
Thank you for all your valuable responses.

I found this as a possible solution to consider with a shorter flexible insert between crossover stubs from each side?

thisoldtractor.com/moto_guzzi_loopframe_exhaust_-_flexible_crossover_pipe.html
 
My 2014 California 1400 Custom still has none of these issues. 28000 miles so far. Bought new in 2015. Almost immediately replaced the stock Muffler/cats with the Mistral stainless items they were selling in 2015 (they offer a differently appearing model now). They are a huge amount lighter than stock, as they are basically straight pipes with an included DB killer.. Guess that's why my crossover hasn't cracked...
 
My 2014 California 1400 Custom still has none of these issues. 28000 miles so far. Bought new in 2015. Almost immediately replaced the stock Muffler/cats with the Mistral stainless items they were selling in 2015 (they offer a differently appearing model now). They are a huge amount lighter than stock, as they are basically straight pipes with an included DB killer.. Guess that's why my crossover hasn't cracked...
I know I'm probably testing fate by posting this but 85,000kms on my Eldo with original mufflers and no cracking.
 
After 100 years of manufacturing, that is just inexcusable. Chinese parts supplier no doubt. When will people realize that cheap goods are just that, cheap goods. It's a shame really...
 
Well , I know most of the electrics on my 2018 Eldorado are of Chinese manufacture , but are you sure the exhaust
system is also ? Peter
 
Not sure but these types of issues have never happened to any other exhaust ever on another Moto Guzzi motorcycle that I can remember.

The caliber of the components manufactured in Italy has always been excellent.
 
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